If air got in the ABS block or the pre-charge pump, you need the right tool to engage then to finish bleeding. There should be a big rubber disk to seal the air over the reservoir and for the other side thread tape should resolve. I seemed to have lucked out and no air got in when. I replaced both rear lines but there seems to be a tiny bit of air in the lines I can feel a bit of compression nothing I can't life with until I do a full exhange of fluid that is already planned.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)